The shot put is an athletics event in which competitors "throw" a shot as far as possible - Scottish Highers Physics - Question 1 - 2015
Question 1
The shot put is an athletics event in which competitors "throw" a shot as far as possible. The shot is a metal ball of mass 4.0 kg. One of the competitors releases t... show full transcript
Worked Solution & Example Answer:The shot put is an athletics event in which competitors "throw" a shot as far as possible - Scottish Highers Physics - Question 1 - 2015
Step 1
State the release speed of the shot.
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Answer
The release speed of the shot at an angle of projection of 40° is 11 m/s, as indicated by the graph.
Step 2
Calculate the horizontal component of the initial velocity of the shot.
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Answer
To calculate the horizontal component of the initial velocity (vx), we use the formula:
vx=vimesextcos(heta)
Substituting in the values:
≈ 11 imes 0.766 = 8.43 ext{ms}^{-1}$$
So, the horizontal component is approximately 8.4 m/s.
Step 3
Calculate the vertical component of the initial velocity of the shot.
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To find the vertical component of the initial velocity (vy), we use:
vy=vimesextsin(heta)
Thus:
≈ 11 imes 0.643 = 7.07 ext{ms}^{-1}$$
The vertical component is approximately 7.1 m/s.
Step 4
Calculate the total time between the shot being released and hitting the ground.
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Answer
To calculate the total time of flight (T), we need to consider the time to reach maximum height and the time to fall back down:
T=textup+textdown
Given that the time to reach maximum height is 0.76 s and using the symmetry of projectile motion, the time to fall back down is approximately the same:
T=0.76s+0.76s=1.52s.
Thus, the total time of flight is approximately 1.52 seconds.
Step 5
Calculate the range of the shot for this throw.
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Answer
The range (R) of the shot can be calculated using the formula:
R=vximesT
Substituting the values:
R=8.43extms−1imes1.52exts≈12.8extm
Therefore, the range of the shot is approximately 12.8 meters.
Step 6
Explain the effect of increasing the angle of projection on the kinetic energy of the shot at release.
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Answer
Increasing the angle of projection generally increases the vertical component of the velocity while decreasing the horizontal component. However, the total velocity at release remains constant unless additional force is applied, hence the total kinetic energy:
KE = rac{1}{2}mv^2
is largely dependent on the release speed. Therefore, while the distribution of kinetic energy shifts with a higher angle, limiting factors like air resistance and optimal angles (usually around 45° for maximum distance) must also be considered for practical applications.
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